Hot-air furnace



(No Model.) I

H. C. STEINHOFP.

HOT AIR FURNACE.

Patented July 28, 1896.

UNITED STATES PATENT OFFICE.

HENRY C. STEINHOFF, OF WEST HOBOKEN, NEW JERSEY.

HOT-AIR FU RNACE.

SPECIFICATION forming part of Letters Patent No. 564,804, dated Jul 28,1896.

Application filed March 20, 1896.

To all whom it may concern.-

Be it known that I, HENRY (J. STEINHOFF, of West Hoboken, Hudson county,New Jersey, have invented an Improved Hot-Air Furnace, of which thefollowing is a specification.

This invention relates to a furnace by means of which a body of air isheated and mixed with superheated steam, so that the steam serves todrive the air through the registers of the various rooms, while thequantity of moisture admitted to the rooms is limited.

In the accompanying drawings, Figure 1 is a vertical central section ofmy improved hotair furnace; and Fig. 2,a cross-section on line 2 2, Fig.1.

The letter a represents the fire-chamber of the furnace that connects atits upper end with a smoke-flue b. This flue is preferably of annularform, so as to give 01f its heat, and has its exit at 17.

Within the upper portion of the chamber a there is suspended a smallsteam-boiler c, of suitable construction. Steam-pipes c 0 conduct thesteam from boiler c to a perforated superheater d, located above thegrate and beneath the boiler. Thus it willbe seen that the heat from thefire-pot has access to the superheater as well as to the boiler. Thepipe 0 terminates in a nozzle 0 which enters the flaring mouth of pipe 0In this way an injector is formed by which air is drawn by the steaminto the superheater. From the superheater the mixture of air and drysteam flows into a coiled pipe d, having a number of perforations (1through which the mixture is ejected in an upward direction. The entirefire-chamber, including the delivery-pipe d, is inclosed by a shell 6,between which and the body of the furnace an air-heating chamber 6 isformed. Cold air is admitted to this chamber at 6 while the heated airis conducted to the registers of the various rooms by a number of fluesor pipes 6 In use, the steam delivered by the pipe cl will cause astrongflow of air through chamber e and into the flues e The steam will SerialNo. 584,047. (No model.)

of course mix with the air and constitute a forcing agent by which thehot air is freely driven to remote and weather-exposed rooms, so that afine heating effect is obtained.

By superheating the steam and mixing it with a body'of air at o thesteam is so divided and dried that the quantity of moisture admitted tothe rooms is limited and that the steam will not condense upon thewindows. Of course the steam may be discharged and mixed with the heatedair at any desirable point, such, for instance, as the air-inlet openinge as is indicated by the dotted pipe (1 In my improved furnace the flowof air to the rooms is always in proportion to the volume of steamejected. That is to say, if the tire is low and little steam isconsequently made, a proportionately small volume of air will be drawninto the chamber 0, and will be driven into the building. In this way Iavoid the possibility of driving an insnfficiently-heated or an entirelycold body of air into the rooms.

What I claim is 1. In a hot-air furnace the combination of afire-chamber with a steam boiler, a'superheater connected therewith, ahot-air chamber surrounding the fire chamber, and a steam-delivery pipethat discharges the steam from the superheater into the hot-air chamber,substantially as specified.

2. In a hot-air furnace the combination of a fire-chamber with asteam-boiler, a superheater, steam-pipes connecting the boiler with thesuperheater, an air-injector communicating with the steam-pipes, ahot-air chamber surrounding the fire-chamber, and provided with an airinlet and outlet, and a steam-delivery pipe that discharges the steamfrom the superheater into the hot-air chamber, substantially asspecified.

HENRY C. STEINHOFF.

